JPS637971A - Sheet for receiving thermal transfer - Google Patents

Abstract

PURPOSE:To enhance the fixing property of a dye, by containing a modified polyester resin synthesized using polyol containing a phenyl group as one of polyol components in a receiving layer. CONSTITUTION:A receiving layer 3 is constituted so as to contain a modified polyester resin having a phenyl group in the main chain thereof. MW of the modified polyester resin is pref. 10,000-30,000 and the polymerization degree thereof is pref. about 100-200. The phenyl group is introduced into the main chain using polyol having the phenyl group as one of polyol components. Polyol containing the phenyl group is pref. contained in polyols to be used in an amount of about 1-100mol%.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a thermal transfer sheet that is used in combination with a thermal transfer sheet and has excellent dye dyeability.

(Prior art) A thermal transfer sheet having a dye layer containing a sublimable disperse dye is heated in spots according to an image signal using a thermal head, etc., and an image made of the dye transferred to the surface of resin-coated paper is created. Attempts are being made to form a

However, with conventional thermal transfer sheets, the dye adhesion is not sufficient, and in order to obtain high-density images, an excessive amount of heat is required during printing, which increases the burden on the thermal conductor and drives the thermal head. There was a drawback that the voltage was high.

(Problems to be Solved by the Invention) Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques and to improve the dyeability of dyes.

Through research conducted by the present inventors, it was discovered that dye dyeability was achieved by constructing the receptor layer using a modified polyester resin having a long-chain methylene base material, and this led to the completion of the present invention.

In the present invention, a thermal transfer sheet is used in combination with a thermal transfer sheet having a dye layer containing a dye that is transferred by melting or sublimation by heat, and the dye that transfers from the thermal transfer sheet is transferred to the surface of a sheet-like base material. A thermal transfer sheet having a receiving layer, the receiving layer containing a modified polyester resin synthesized using a polyol containing a phenyl group as a polyol component. This makes it possible to overcome the drawbacks of the conventional techniques described above.

The thermal transfer sheet 1 of the present invention includes, for example, a sheet-like base material 2
It has a structure having a receptive layer 3 thereon, and an intermediate layer 4 is provided between the sheet-like base material 2 and the receptive layer 3, if necessary. The receiving layer 3 may be provided on one side of the sheet-like base material 2.

(Sheet-like base material) As the sheet-like base material 2, ■synthetic paper (polyolefin type, polystyrene type, etc.), ■high-quality paper, art paper, coated paper, cast-coated paper, wallpaper-backed paper, synthetic resin or emulsion-impregnated paper. , synthetic rubber latex-impregnated paper, synthetic resin-loaded paper, paperboard, or natural fiber paper such as cellulose fiber paper; *Various plastic films or sheets such as polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, methacrylate, and polycarbonate. Can be used. Among these, the synthetic paper (1) is preferable because it has a microvoid layer with low thermal conductivity (in other words, high heat insulation) on its surface. Also, the above ■
0 Typical examples of laminates include cellulose fiber paper, synthetic paper,
Alternatively, a laminate of cellulose fiber paper and a plastic film or sheet may be used. Among these, a laminate of cellulose fiber paper and synthetic paper has a structure in which the cellulose fiber paper does not compensate for the thermal instability (expansion and contraction, etc.) of synthetic paper.
Synthetic paper - cellulose fiber paper - can exploit the high thermal sensitivity of printing due to the low thermal conductivity of synthetic paper, and in order to balance the front and back sides of the laminate in this combination, synthetic paper - cellulose fiber paper -
It is best to use a three-layer laminate of synthetic paper, which can reduce curling caused by printing.

As the synthetic paper used for the above-mentioned laminate, generally any material can be used as long as it can be used as a base material for a thermal transfer sheet, but in particular synthetic paper with a paper-like layer having micropores is used. (For example, commercially available synthetic paper: YUPO: manufactured by Oji Yuka Synthetic Paper) is desirable. The fine pores in the above-mentioned paper-like layer can be formed, for example, by stretching a synthetic resin containing a fine filler. Thermal transfer sheet constructed using synthetic paper provided with a paper-like layer containing micropores has the effect that when an image is formed by thermal transfer, the image density is high and there is no variation in the image. It is thought that the fine pores have a heat insulating effect, the thermal energy efficiency is good, and the fine pores have good cushioning properties, which contribute to the receiving layer provided on the synthetic paper and on which images are formed. . Moreover, it is also possible to provide the paper-like layer containing the above-mentioned micropores directly on the surface of a core material such as cellulose fiber paper.

A plastic film can be used in addition to the cellulose fiber paper in the laminate, and a laminate of the cellulose fiber paper and a plastic film can also be used.

Examples of methods for bonding synthetic paper and cellulose fiber paper include bonding using a conventionally known adhesive side, bonding using an extrusion lamination method, and bonding by thermal adhesion. The method for attaching the plastic film is the lamination method, which also serves as the formation of the plastic film at the same time.
Examples include pasting by a calendar method or the like. The above-mentioned pasting means is washed as appropriate depending on the material of the synthetic paper and the material to be pasted. Specific examples of the adhesive include emulsion adhesives such as ethylene-vinyl acetate copolymer and polyvinyl acetate;
Examples include water-soluble adhesives such as polyester containing carboxyl groups, and examples of adhesives for lamination include organic solvent solutions such as polyurethane and acrylic. Adhesives include:

(Receiving Layer) The material constituting the receiving layer N3 is a layer for receiving (image receiving) an image of a dye transferred from a thermal transfer sheet, such as a sublimable disperse dye, and for maintaining the image formed by the receiving.

In the present invention, the receptor N3 is composed of a modified polyester resin having a phenyl group in its main chain.

The molecular weight of the modified polyester resin is 10,000 to 30,000. Introduction of a phenyl group into the main chain, which preferably has a degree of polymerization of about 100 to 200, is carried out by using a polyol having a phenyl group as the polyol component. It is preferable that the polyol containing a phenyl group accounts for about 1 to 100 mol% of the polyol used.

Thermal transfer sheets made using the above-mentioned modified polyester resin have excellent dye adhesion properties, but this is because the inclusion of phenyl groups facilitates the formation of an amorphous state in the polymer, which allows the dye to diffuse. This tendency is considered to be due to the fact that the phenyl group is present in the main chain rather than in the side chain.In addition, the presence of phenyl groups makes it difficult for dyes, especially anthraquinone dyes, to enter the polymer. It is thought that an increase in solubility or affinity also contributes to dye stainability.

The modified polyester resin is synthesized using the following modified polyol components as polyol components.

Modified polyol components Bisphenol A Bisphenol B Bisphenol AF Bisphenol S As polyol components, ethylene glycol, neopentyl glycol, etc. that do not have a phenyl group and those that have a phenyl group may be used in combination.

Note that each component in the synthesis does not have to be a single component, and a plurality of components may be combined as appropriate.

The modified polyester resin can also be used in combination with other resins to form the receptor layer.

For example, the following synthetic resins from fat to tel can be used alone or in combination of two or more.

Those with fat ester bonds.

Polyester resin (other than phenyl modified), polyacrylic ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, vinyl toluene acrylate resin.

Mountain) Those with urethane bonds.

Polyurethane resin, etc.

Contains a tel amide bond.

Polyamide resin (nylon).

(Those with dl urea bond.

Urea resin etc.

tel and other substances with highly polar bonds.

Polycaprolactone resin, polystyrene resin, polyvinyl chloride resin, polyacrylonitrile resin, etc.

For example, the receptor layer 3 is made of a mixed resin of modified polyester and normal polyester resin (not phenyl modified). Saturated polyesters include, for example, Byron 200, Byron 290, Byron 600 (Toyo Casting Co., Ltd.), KA-1038C (Arayo Kagaku Co., Ltd.), and TP22.
0, TP235 (all Japanese synthetic types), etc. are used.

Alternatively, the receiving layer is composed of a modified polyester resin and a vinyl chloride resin/vinyl acetate copolymer resin. The vinyl chloride/vinyl acetate copolymer resin preferably has a vinyl chloride component content of 85 to 97% by weight and a degree of polymerization of about 200 to 800.The vinyl chloride/vinyl acetate copolymer resin does not necessarily have a vinyl chloride component and vinyl acetate. Not limited to copolymers containing only copolymer components, vinyl alcohol components,
It may also contain a maleic acid component or the like.

The receptor N3 may also be composed of a mixed resin of a modified polyester resin and a polystyrene-based resin, for example, composed of a styrenic monomer, such as a single or copolymer of styrene, α-methylstyrene, or vinyltoluene. Polystyrene resins, or styrene resins that are copolymers of the styrene monomers and other monomers, such as acrylic or methacrylic monomers such as acrylic esters, methacrylic esters, acrylonitrile, methacrylonitrile, or maleic anhydride. Examples include copolymer resins.

When using modified polyester resin and other resins together,
Although it depends on the degree of phenyl modification of the modified polyester resin, it is preferable to use 0 to 100 parts by weight of the other resin per 100 parts by weight of the modified polyester resin. In other words,
When used together as above, total resin mold 1100g
The modified polyester resin may account for 50 to 100 g. In any of the above embodiments, the whiteness of the receptor layer 3 is improved to further enhance the clarity of the transferred image, and the surface of the heat transfer sheet is provided with writability. However, a white pigment can be added to the receiving layer 3 for the purpose of preventing the transferred image from being retransferred. As the white pigment, titanium oxide, zinc oxide, kaolin, clay, calcium carbonate, finely powdered silica, etc. are used, and as described above, two or more of these can be used in combination. In addition, in order to further increase the light resistance of the transferred image, an ultraviolet absorber is added to the image-receiving layer.
One or more additives such as a light stabilizer or an antioxidant can be added as necessary. The amounts of these ultraviolet absorbers and light stabilizers added are preferably 0.05 to 10 parts by weight and 0.5 to 3 parts by weight, respectively, per 100 parts by weight of the resin constituting the receiving layer 3.

In the thermal transfer sheet of the present invention, the 0M molding agent that can contain a mold release agent in the receptor layer to improve the mold releasability from the thermal transfer sheet is polyethylene wax,
Examples include solid waxes such as amide wax and Teflon powder; fluorine-based and phosphoric acid ester-based surfactants; and silicone oil, with silicone oil being preferred.

As the above-mentioned silicone oil, an oily one can be used, but a curable type is preferable. Examples of the curable silicone oil include a reaction-curing type, a photo-curing type, a catalytic-curing type, and a reaction-curing type. Particularly preferred are silicone oils. As a reaction curing silicone oil,
Preferably, an amino-modified silicone oil and an epoxy-modified silicone oil are reacted and cured, and examples of the amino-modified silicone oil include KF-393 and KF-85.
7, KF-858, X-22-3680, X-22-3
80IC (manufactured by Shin-Etsu Chemical Co., Ltd.), etc., and examples of epoxy modified silicone oil include KF-100T,
Examples include KF-10i, KF-60-164, and KF-103 (manufactured by Shin-Etsu Chemical Co., Ltd.). In addition, KS-7 is a catalyst-curing or photo-curing silicone oil.
05F, KS-770 (catalyst curing silicone oil: manufactured by Shin-Etsu Chemical Co., Ltd.), KS-720, KS-7
74 (photocurable silicone oil: manufactured by Shin-Etsu Chemical Co., Ltd.), and the like. The amount of these curable silicone oils added is 0.5 to 30% by weight of the resin constituting the image receiving layer.
is preferred. Further, a mold release agent can be provided by dissolving or dispersing the above-mentioned mold release agent in a suitable solvent and coating it on a part of the surface of the receptor layer 3, followed by drying. As the agent, a reaction cured product of the above-mentioned amino-modified silicone oil and epoxy-modified silicone oil is particularly preferred.

The thickness of the release agent layer is 0.01 to 58 m, especially 0.05 to 2 m.
μm is preferred.

Note that if silicone oil is added when forming the receiving layer, the release agent layer can be formed even if the silicone oil bleeds onto the surface after coating and is then cured.

The above-mentioned white pigment, ultraviolet absorber, light stabilizer, antioxidant, and mold release agent can be applied so as to be included in the receiving layer on one side or both sides, if necessary.

The formation of the receptive layer 3 can be carried out by a known coating or printing method using a receptive layer forming composition obtained by dissolving or dispersing the material for forming the receptive layer on the sheet-like base material 2. , it may be performed by a method in which the image is once formed on a partial carrier different from the sheet-like base material 2 and then transferred onto the sheet-like base material 2 again.

As a partial carrier, a sheet with a releasable surface is used.For example, ■Cellulose fiber paper or synthetic paper with an undercoat layer applied to the surface and then a release silicone layer applied, ■Cellulose fiber On some carriers, such as paper surfaces coated with extrusion polyolefin resins or polyester resins, or plastic films such as polyester films with a release silicone layer applied, etc.
After forming a receptor layer in the same manner as on the sheet-like base material 2, an adhesive layer is formed if necessary. This adhesive layer is used when transferring the image receiving layer onto the sheet-like base material 2.
This is to ensure adhesive strength between the sheet-like base material 2 and the receiving layer 3. In this method, another layer, for example, an intermediate layer imparting cushioning properties, is formed on a portion of the carrier, and the intermediate layer and the receiving layer are transferred onto the sheet-like base material 2 at the same time. It's okay. When the intermediate layer also serves as an adhesive, it is not necessary to form the adhesive layer on the partial carrier; in any case, the adhesive layer is formed on the sheet-like substrate and on the temporary carrier. The adhesive layer is formed on the sheet-like base material 2, and only the receiving layer is placed on the temporary carrier.
Alternatively, the receiving layer and the intermediate layer may be formed in this order and then transferred.

When a method is adopted in which the receptive layer 3 is once formed on a temporary carrier and then formed on the sheet-like base material 2 by a transfer method, the surface of the receptive layer formed on the sheet-like base material 2 is temporarily Because the surface condition of the carrier is transferred, it has very good smoothness, and the receptive layer formed directly on the sheet-like base material 2 is different from the one formed by the transfer method (the smoothness is inferior when lapeled). If you want to obtain clearer and more detailed images,
It is better to use the transcription method.

The adhesive may be any adhesive that can bond the receptor layer and the base material, such as polyester, polyacrylic ester,
Organic solvent solutions or emulsions of polyurethane, polyvinyl chloride, polyolefin, ethylene-vinyl acetate copolymers, synthetic rubber, etc. can be used. The adhesive may be a thermal adhesive type or a room temperature adhesive type. In the case of a thermal bonding type, thermal bonding using a true melt type adhesive such as wax, ethylene/vinyl acetate copolymer resin, polyolefin, or petroleum resin, or sandwich lamination using an extrusion film such as a polyolefin film may be used.

Double-sided tape may be used as an adhesive that also serves as an intermediate layer.Double-sided tape is made by impregnating rayon paper with an acrylic adhesive and drying it.After drying, the double-sided tape has micropores that form a foam layer. It seems that they play an equivalent role.

(Intermediate Layer) The intermediate N4 is either a cushioning layer or a porous layer depending on the material it is made of, or may also serve as an adhesive in some cases.

The cushioning layer is 1 defined in JIS-6301.
00% modulus is 100 Kg/cal or less, and if the 100% modulus exceeds LOOKg/-, the rigidity is too high, so such a resin is used to form the intermediate layer. Even if the thermal transfer sheet and the thermal transfer layer are formed, sufficient adhesion during printing cannot be maintained, and the lower limit of the 100% modulus is actually
It is about 0.5 Kg/-.

Examples of resins that can be synthesized under the above conditions include the following.

Polyurethane resin Polyester resin Polybutadiene resin Polyacrylate ester resin Epoxy resin Polyamide resin Rosin modified phenol resin Terpene phenol resin Ethylene/vinyl acetate copolymer resin The above resins can be used singly or in combination of two or more. The above resins are relatively sticky, so if there is a problem during processing, inorganic additives,
For example, silica, alumina, clay, calcium carbonate, etc., or amide-based substances such as stearamide may be added.

The cushioning layer can be formed by kneading the resin as described above with a solvent, diluent, etc. along with other additives as necessary to form a paint or ink, and drying it as a coating film using a known coating method or printing method. , its thickness is 0
．． 5-50pm, more preferably 2-20pm. The cam is Cheng Ling. If the thickness is 0.5 μm, it will not be able to absorb the roughness of the surface of the sheet-like base material provided, and therefore it will not be effective.
If it exceeds .mu.m, not only will the effect not be improved, but the receiving layer will become too thick and protrude, causing trouble when winding or stacking, and is not economical.

Formation of such an intermediate layer improves the adhesion between the thermal transfer sheet and the sheet to be thermally transferred, probably because the intermediate layer itself has low rigidity and is deformed by pressure during printing. It is presumed that this type of resin usually has a low glass transition point or softening point, and the thermal energy applied during printing causes the rigidity to decrease even more than at room temperature, making it easier to deform. .

The porous layer 3 is composed of: (1) a synthetic resin emulsion such as polyurethane, a synthetic rubber latex such as methyl methacrylate-butadiene, which is bubbled by mechanical stirring, and then applied onto the base material 2 and dried; (2) the above synthetic resin emulsion; , a liquid obtained by mixing the synthetic rubber latex with a foaming agent is applied to the base material 2.
The layer coated on top and dried, ① A liquid mixture of a foaming agent mixed with a synthetic resin such as PVC plastisol or polyurethane or a synthetic rubber such as styrene-butadiene is applied onto the base material 2 and foamed by heating. Layer, ■Thermoplastic resin or synthetic rubber as an organic medium? After I understood it and 8 years later)
Non-solvents (including those containing water as the main component) that are compatible with the Rm medium and insoluble in thermoplastic resins or synthetic rubbers because of their evaporation rate compared to the medium. A microporous layer or the like is used in which a mixed liquid is applied onto the base material 2 and dried to form a microscopically agglomerated film. Since the bubbles in the layers (■ to ■) above are large, the air bubbles are received on the layers. When the forming solution No. 3 is applied and dried, there is a risk that the surface of the dry receiving layer 3 will be uneven. Therefore, in order to obtain a surface of the receptor layer 3 with small irregularities and on which a highly uniform image can be transferred, it is preferable to provide the microporous layer (2) above as the porous layer.

The thermoplastic resin used for forming the above microporous layer includes saturated polyester, polyurethane,
Vinyl chloride/vinyl acetate copolymers, cellulose acetate propionate, etc. may be mentioned, and the synthetic rubbers that can be used similarly include styrene-butadiene, isoprene, urethane, and the like. Various organic solvents and nonsolvents can be used to form the microporous layer, but hydrophilic solvents such as methyl ethyl ketone and alcohol are usually used as the organic solvent, and water is also used as the nonsolvent. used.

The thickness of the porous layer in the present invention is preferably 3 μm or more, particularly preferably 5 to 20 μm. If the thickness of the porous layer is less than 3 μm, the cushioning and heat insulation effects will not be exhibited.

Although the explanation has been complicated, as mentioned in the explanation of the method for forming the receptor layer, the intermediate layer may also serve as an adhesive in some cases.

The above-mentioned intermediate layer may be provided on both sides of the non-thermal transfer sheet when the receiving layer is provided on both sides, or may be provided on only one side.

In order to suppress the generation of static electricity during the processing of the thermal transfer sheet or when it runs in a printer, an antistatic agent may be contained in the receptor layer on at least one side or on the surface of the receptor layer. Antistatic agents include surfactants such as cationic surfactants (for example, quaternary ammonium salts, polyamine derivatives, etc.), anionic surfactants (for example, alkyl phosphates, etc.), amphoteric surfactants or nonionic surfactants. type surfactants.

The antistatic agent may be applied to the surface of the receptor layer by gravure coating, bar coating, etc., or may be kneaded into the resin of the receptor layer and transferred to the surface of the receptor layer during coating and drying of the receptor layer.

A cationic acrylic polymer can also be used as an antistatic agent to be mixed with the receptor layer resin.

(Actions and Effects of the Invention) The thermal transfer sheet of the present invention has a receiving layer made of a modified polyester resin synthesized using a polyol containing a phenyl group, so that it can be printed by thermal hefdom etc. in combination with a thermal transfer sheet. Images formed in this manner have the advantage of high density due to the presence of phenyl groups in the polyol component.

(Example) In the following Examples and Comparative Examples, the production of a thermal transfer sheet and a thermal transfer sheet, printing using both sheets, and testing of a thermal transfer sheet were conducted as follows.

Ikzen J [Tencho-2] - 6 μm thick polyethylene terephthalate film with corona discharge treatment on one side (Toyo Mold: 5-PET)
A thermal transfer layer is formed by applying a thermal transfer layer forming composition having the following composition onto the corona discharge treated surface of the substrate using wire bar coating so that the dry thickness is 1 μm. and silicone oil (X-41) on the back side.
-4003A (manufactured by Shin-Etsu Silicone) was applied with a dropper and spread over the entire surface to form a slippery layer, and then spread over the entire surface to form a slippery layer to obtain a thermal transfer sheet.

Composition for forming thermal transfer layer Disperse dye・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・4 parts by weight (Nippon Kayaku: Kayase Soto Blue-714) Ethyl hydroxycellulose 5 parts by weight (manufactured by Vercules) Toluene・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・4 parts by weight Methyl ethyl ketone・・・・・・・・・・・・40 parts by weight Dioxane・・・・・・・・・・・・・・・・・・・・・・・・
......10 parts by weight of heat transfer synthetic paper with a sheet thickness of 150 μm (manufactured by Oji Yuka: Yupo FPG-1
50) was used as a base material, a composition for forming a receptor layer having the following composition was coated on the surface of the base material by wire bar coating so that the dry thickness was 4 μm, and after temporary drying with a dryer, 1
This was dried for 30 minutes in an open environment at 00° C. to form a receptor layer, which was then used as a thermal transfer sheet.

Composition resin for forming receptor layer・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・14 parts by weight Amino-modified silicone oil 1 part by weight (Shin-Etsu Chemical type: KF-396) Epoxy-modified silicone oil・...1 part by weight (
Shin-Etsu Chemical Type: X-22-343>Toluene...
・・・・・・・・・・・・・・・・・・・・・・・・
...42 amount s methyl ethyl ketone...
......42 parts by weight The above thermal transfer sheet and the sheet to be thermally transferred are stacked so that the thermal transfer layer and the receptor layer are in contact with each other, and the thermal transfer sheet is heated with a thermal head from the base material side of the thermal transfer sheet. Output IW/dot, pulse width 0.3 to 0.45 m/sec, dot rotation 3
When the cyan disperse dye in the thermal transfer layer of the thermal transfer sheet was transferred to the receiving layer of the thermal transfer sheet by heating with dot/fi, a clear cyan image was formed.

Example The following components and ml of calcium acetate and antimony dioxide as catalysts were placed in a Claisen flask-type reactor equipped with an air cooler, and the temperature was gradually raised to about 150°C in a N2 atmosphere. The reaction was carried out by stirring at this temperature for 1 hour, and then the reaction product was placed in a Pyrex tube equipped with a thermocouple, completely shutting off the 0□, and the reaction was carried out at 27
A polycondensation reaction was carried out for 2 hours at 5° C. and 0.1” and 0.05 mmHg to obtain a phenyl-modified polyester resin.

LL Acid component terephthalic acid・・・・・・・・・・・・・・・・・・
...80 parts by weight isophthalic acid...
・・・・・・・・・・・・・・・20 parts by weight Polyol component ethylene glycol・・・・・・・・・・・・5
0 parts by weight Bisphenol A・・・・・・・・・・・・・・・
・・・・・・50 weight 1 part 11 tan 1 Acid component Terephthalic acid・・・・・・・・・・・・・・・・・・・・・
・・・・・・40 parts isophthalic acid・・・・・・・・・
・・・・・・・・・・・・・・・40 parts by weight Sepatic acid・・・・・・・・・・・・・・・・・・・・・・・・・
...20 parts by weight polyol component ethylene glycol...4
0fE1 part neopentyl glycol・・・・・・・・・
40 parts by weight Bisphenol B・・・・・・・・・・・・
...20 parts by weight 1 itl↓ The modified polyester obtained in Example 1 and vinyl chloride/vinyl acetate copolymer resin (manufactured by Union Carbide, Vinylye-VYHH) were mixed at a weight ratio of 1:1. I used something.

Comparative example 1 Acid component terephthalic acid・・・・・・・・・・・・・・・・・・
・・・・・・40 parts by weight Isophthalic acid・・・・・・・・・
・・・・・・・・・・・・・・・40 parts by weight Sepatic acid・・・・・・・・・・・・・・・・・・・・・・・・・
...20 parts by weight polyol component ethylene glycol...5
0m: IT part neopentyl glycol...
- 50 parts by weight When a thermal transfer sheet was formed using the resin obtained above and printed, the optical reflection of Examples 1 to 3 was higher than that of Comparative Example 1 by 0.2 with an optical reflection of 74 degrees. It was found that there was an improvement of ~0.5.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of the thermal transfer sheet of the present invention.

Claims (2)

[Claims] (1) Used in combination with a thermal transfer sheet that has a dye layer containing a dye that transfers by melting or sublimating with heat, and has a receiving layer on the surface of the sheet-like base material that receives the dye that transfers from the thermal transfer sheet. 1. A thermal transfer sheet characterized in that the receptor layer contains a modified polyester resin synthesized using a polyol containing a phenyl group as a polyol component. (2) The thermal transfer sheet according to claim 1, wherein the receiving layer contains a blend resin of a modified polyester resin and another resin.